Head of a fastener driver



FIG. 1 is a top-front-left perspective view of a head of a fastener driver showing my new design;

FIG. 2 is a bottom-rear-right perspective view thereof;

FIG. 3 is a front elevational view thereof, the rear elevational view being a mirror image thereof;

FIG. 4 is a left-side elevational view thereof, the right-side elevational view being a mirror image thereof;

FIG. 5 is an enlarged top plan view thereof; and,

FIG. 6 is an enlarged bottom plan view thereof.

The broken lines depict portions of the head of a fastener driver in which the design is embodied that are not considered part of the claimed design. 

CLAIM The ornamental design for a head of a fastener driver, as shown and described. 